Persons RUS  ENG    JOURNALS   PEOPLE   ORGANISATIONS   CONFERENCES   SEMINARS   VIDEO LIBRARY   PACKAGE AMSBIB     Engel, Friedrich (1861–1941) Birth date: 26.12.1861 https://www.mathnet.ru/eng/person39289 List of publications on Google Scholar https://zbmath.org/authors/ai:engel.friedrich Publications in Math-Net.Ru Citations 1927 1. F. Engel, “Zur Dreiecks-geometrie der Lobatschefskijschen Ebene”, In mem. Lobatschevskii, 2 (1927),  13–16